[Gasification] Coal Gasification
linvent at aol.com
linvent at aol.com
Wed Jun 17 09:00:46 CDT 2015
As to gasifying coal, what is the sulfur path? Even if an updraft unit were operated is a close combustion configuration, complete combustion of the tars and oils would occur in the combustor leaving minimal particulate emission and if operating a kiln, any particulate would be a problem of contaminating the surfaces of fired ceramics. So, it is not clear what the emission issues were that required court orders, as regardless of the basic system, sulfur emissions would still be a major factor in pollution and human health.?
In a close coupled system, the water could merely go into the combustor and not be dealt with which is not the case where maximum removal of it from the gas stream prior to engine or catalyst operation is a necessity.?
Gasifying low rank coals is a problem and one of the largest gasifier projects in the US, a partnership between KBR, DOE, The Southern Companies as a demonstration "Clean Coal" technology has run over budget, time and from my evaluation of the process, is quite complicated with other methods of accomplishing the same occur to me without the complicated design. If one wishes to operate on lignitic or other low rank coals, we have a design that should be considered.?
Sincerely,
Leland T. "Tom" Taylor
Thermogenics Inc.?
-----Original Message-----
From: DariusTamizi <darius_tamizi at hotmail.com>
To: Discussion of biomass pyrolysis and gasification <gasification at lists.bioenergylists.org>
Sent: Wed, Jun 17, 2015 2:48 am
Subject: Re: [Gasification] Coal Gasification
Dear Rajiv Gupta,
I am one of your gasifier user. According to my experience, when I load the Charcoal bed too high (obove the Nozle) or when I forget to rotate the combrotor to remove the charcoal, the charcoal will ignited infront the nozles and the nozles are burned (disappeared) in 5-10 minute.
I wonder if? the Nozle can stay for how long when you burn coal?
Regards,
Darius
?On 5/26/2015 9:27 PM, Rajiv Gupta wrote: To the list courtesy of Ankur Scientific: Dear Mr. Tom, Please find attached our Coal Gasifier brochure for your reference. Best Regards, Rajiv Gupta -----Original Message----- From: BC Jain [mailto:bcjain at ankurscientific.com] Sent: 26 May, 2015 12:04 PM To: 'Tom Miles' Thanks, Tom. I do not know if you are aware of the coal gasifier series launched by us - extremely clean gasification at a few hundred kilograms to a few tons per hour processing rates. A number of these plants have been set up recently in a town in Gujarat, famous for ceramic industry. Earlier, updraft gasifiers were used and the pollution led to banning of these by the highest court in Gujarat. Our technology was a response to solve this issue and allows industry to use a low cost fuel in a totally environment -friendly manner - no condensate, no process water and no air pollution. Kiln temperatures of upto 1160 deg C have been consistently met. Plants installed have little maintenance and very high reliability as a continuous process industry is involved. We are also offering these gasifiers in power mode for power outputs of upto 5 MW or so. Coal used is typically Indonesian, low ash which is very regularly used in India. I shall ask a colleague of mine to send relevant details to you. Best wishes, BC JAIN Rajiv to talk to me. -----Original Message----- From: Tom Miles [mailto:tmiles at trmiles.com] Sent: Tuesday, May 26, 2015 10:58 AM To: 'BC Jain' Subject: RE: SPAM: Re: [Gasification] Gasification Digest, Vol 57, Issue 9 BC, Good to see you that you are monitoring the coal gasifier discussion. You are still a member of the list so you can post directly to the discussion. Send to: gasification at lists.bioenergylists.org> Kind regards, Tom Today's Topics: 1. Difference between biomass and coal gasification (Saiteja Chinta) 2. Re: Difference between biomass and coal gasification (Thomas Koch) 3. Re: Difference between biomass and coal gasification (Mano Va) 4. Re: Difference between biomass and coal gasification (Arnt Karlsen) 5. Re: Difference between biomass and coal gasification (Juan Moreno) ---------------------------------------------------------------------- Message: 1 Date: Mon, 25 May 2015 11:34:08 +0530 From: Saiteja Chinta <chinta.saiteja at gmail.com> To: gasification at lists.bioenergylists.org Subject: [Gasification] Difference between biomass and coal gasification Message-ID: <CAH6fn7A8LGFaTVeYZQjBjcJKctX6jRsPA8=vUg5wNGEnytBjqA at mail.gmail.com> Content-Type: text/plain; charset="utf-8" Hi all, Thanks for the response, but I am once again stating my question with some specifications. I am interested in coal gasification where coal used is with high ash content and less reactive. Capacity of gasifier is around 30 Tons of coal per day and technology is updraft fixed bed. If the reactor is operated at high temperature to crack any tar, ash would come out in molten form (Not desired) as conditions will cross ash melting point. So in this sense, tar generated after gas cooling be recycled into gasifier? Regards, Saiteja -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.bioenergylists.org/pipermail/gasification_lists.bioenergylists .org/attachments/20150525/7f6caf5d/attachment-0001.html> ------------------------------ Message: 2 Date: Mon, 25 May 2015 06:30:06 +0000 From: Thomas Koch <tk at tke.dk> To: Discussion of biomass pyrolysis and gasification <gasification at lists.bioenergylists.org> Subject: Re: [Gasification] Difference between biomass and coal gasification Message-ID: <4F20766DE525FF408A7C148DBBD0A91D14489957 at SRV-MAIN.tkenergi.local> Content-Type: text/plain; charset="utf-8" Hi Saiteja In an updraft fixed bed gasifier there is no clear link between maximal temperature and tar content in the gas. Slagging takes place in the oxidizing zone in the bottom of the reaction zone, tar is made in pyrolysis zone in the top of the bed. If you observe slagging you can inject water together with the air ? eg if you use a water scrubber as part of you gas cleaning you have a fraction to get rid of. That is one way to reduce the temperature. There Is a lot of reports from the development of the V?lund updraft gasifier in Harbo?re that vould be very relevant for you to read. http://www.res-chains.eu/wp-content/uploads/2013/04/Case-Study-Gasification- Harbo%C3%B8re.pdf Thomas Fra: Gasification [mailto:gasification-bounces at lists.bioenergylists.org] P? vegne af Saiteja Chinta Sendt: 25. maj 2015 08:04 Til: gasification at lists.bioenergylists.org Emne: [Gasification] Difference between biomass and coal gasification Hi all, Thanks for the response, but I am once again stating my question with some specifications. I am interested in coal gasification where coal used is with high ash content and less reactive. Capacity of gasifier is around 30 Tons of coal per day and technology is updraft fixed bed. If the reactor is operated at high temperature to crack any tar, ash would come out in molten form (Not desired) as conditions will cross ash melting point. So in this sense, tar generated after gas cooling be recycled into gasifier? Regards, Saiteja -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.bioenergylists.org/pipermail/gasification_lists.bioenergylists .org/attachments/20150525/74acf41d/attachment-0001.html> ------------------------------ Message: 3 Date: Mon, 25 May 2015 13:18:38 +0530 From: Mano Va <gmmanovassm at gmail.com> To: Discussion of biomass pyrolysis and gasification <gasification at lists.bioenergylists.org> Subject: Re: [Gasification] Difference between biomass and coal gasification Message-ID: <CAKVVU5GZpJcD-EPkAGvXUGnibvG9E6LWjcwcW2vJcPxW7j+-CA at mail.gmail.com> Content-Type: text/plain; charset="utf-8" HI Saiteja Chinta I want to sare some points with u I am interested in coal gasification where coal used is with high ash content and less reactive ** High Ash content Leads to more Clinker formation * ** Its Difficult to continues operation* Capacity of gasifier is around 30 Tons of coal per day and technology is updraft fixed bed **1.25 ton /hr Updraft Leads to more tar formation* If the reactor is operated at high temperature to crack any tar, ash would come out in molten form (Not desired) as conditions will cross ash melting point. **If u maintained high temperature also in updraft moisture content and pyrolysis zone Tar wapers are mixed with gas* So in this sense, tar generated after gas cooling be recycled into gasifier? *May be Make some pellet form can reuse that tar mix with coal powder * On Mon, May 25, 2015 at 11:34 AM, Saiteja Chinta <chinta.saiteja at gmail.com> wrote: Hi all, Thanks for the response, but I am once again stating my question with some specifications. I am interested in coal gasification where coal used is with high ash content and less reactive. Capacity of gasifier is around 30 Tons of coal per day and technology is updraft fixed bed. If the reactor is operated at high temperature to crack any tar, ash would come out in molten form (Not desired) as conditions will cross ash melting point. So in this sense, tar generated after gas cooling be recycled into gasifier? Regards, Saiteja _______________________________________________ Gasification mailing list to Send a Message to the list, use the email address Gasification at bioenergylists.org to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bi oenergylists.org for more Gasifiers, News and Information see our web site: http://gasifiers.bioenergylists.org/ -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.bioenergylists.org/pipermail/gasification_lists.bioenergylists .org/attachments/20150525/d648ecb9/attachment-0001.html> ------------------------------ Message: 4 Date: Mon, 25 May 2015 11:10:22 +0200 From: Arnt Karlsen <arnt at iaksess.no> To: gasification at lists.bioenergylists.org Subject: Re: [Gasification] Difference between biomass and coal gasification Message-ID: <20150525111022.0f7b80bc at nb6.lan> Content-Type: text/plain; charset=US-ASCII On Mon, 25 May 2015 11:34:08 +0530, Saiteja wrote in message <CAH6fn7A8LGFaTVeYZQjBjcJKctX6jRsPA8=vUg5wNGEnytBjqA at mail.gmail.com>: Hi all, Thanks for the response, but I am once again stating my question with some specifications. I am interested in coal gasification where coal used is with high ash content and less reactive. Capacity of gasifier is around 30 Tons of coal per day and technology is updraft fixed bed. ..can this be modified to fit e.g. a 1 - 2 meter tall "battery of Imberts" inside your current reactor vessel? I haven't made up my mind on the ideal sizes for my gasifier and I have a few ideas I'd like to try out. ..regardless of sizes, the hot section of my gasifier is going to be about 1 to 2 meters tall, and I'd like to consentrate on that rather on the other junk I need to test my ideas. If the reactor is operated at high temperature to crack any tar, ash would come out in molten form (Not desired) as conditions will cross ash melting point. ..in my gasifier (75kWe-300kWth "V-hearth Imbert" with tar vapor flare on top of the combustion zone "lens") I simply draw my tar vapors off my fuel hopper that sits on top of my combustion zone "lens", pipe it and some air straight down into my flare and use the combustion zone "lens" to ignite and burn my tar vapors, this also agitates and stabilizes the Imbert combustion zone "lens." ..for updraft, this becomes a little harder, as you have tar vapors "all over" your gas, and not just in your fuel hopper. So in this sense, tar generated after gas cooling be recycled into gasifier? ..your tar vapors generated in your gasifier and then condensed into tar droplets when you cool your gas. ..with your upstream gasifier, you have to clean your entire product gas stream, how much does that cost? ..with my setup, I keep my tar vapors away from my product gas, instead I use them to heat, agitate and stabilize my "Imbert" combustion zone, and then to fuel it, around 2/3 to 4/5 of it. Regards, Saiteja -- ..med vennlig hilsen = with Kind Regards from Arnt Karlsen ...with a number of polar bear hunters in his ancestry... Scenarios always come in sets of three: best case, worst case, and just in case. ------------------------------ Message: 5 Date: Mon, 25 May 2015 08:37:05 -0300 From: Juan Moreno <juan.moreno at umag.cl> To: Discussion of biomass pyrolysis and gasification <gasification at lists.bioenergylists.org> Subject: Re: [Gasification] Difference between biomass and coal gasification Message-ID: <55630961.3090808 at umag.cl> Content-Type: text/plain; charset="windows-1252"; Format="flowed" 1. You want to adapt a biomass gasifier to coal gasifier? 2. If you have high ash coal, you know the components of these ashes, as many inorganic can catalyze your reaction and behave in a better way. 3. What is the calorific value of your coal, will be the subbitominosos type. 4. Do you know which is the melting point of your ashes? Juan Moreno El 25-05-2015 a las 6:10, Arnt Karlsen escribi?: Hi all, Thanks for the response, but I am once again stating my question with some specifications. I am interested in coal gasification where coal used is with high ash content and less reactive. Capacity of gasifier is around 30 Tons of coal per day and technology is updraft fixed bed. ..can this be modified to fit e.g. a 1 - 2 meter tall "battery of Imberts" inside your current reactor vessel? I haven't made up my mind on the ideal sizes for my gasifier and I have a few ideas I'd like to try out. ..regardless of sizes, the hot section of my gasifier is going to be about 1 to 2 meters tall, and I'd like to consentrate on that rather on the other junk I need to test my ideas. If the reactor is operated at high temperature to crack any tar, ash would come out in molten form (Not desired) as conditions will cross ash melting point. ..in my gasifier (75kWe-300kWth "V-hearth Imbert" with tar vapor flare on top of the combustion zone "lens") I simply draw my tar vapors off my fuel hopper that sits on top of my combustion zone "lens", pipe it and some air straight down into my flare and use the combustion zone "lens" to ignite and burn my tar vapors, this also agitates and stabilizes the Imbert combustion zone "lens." ..for updraft, this becomes a little harder, as you have tar vapors "all over" your gas, and not just in your fuel hopper. So in this sense, tar generated after gas cooling be recycled into gasifier? ..your tar vapors generated in your gasifier and then condensed into tar droplets when you cool your gas. ..with your upstream gasifier, you have to clean your entire product gas stream, how much does that cost? ..with my setup, I keep my tar vapors away from my product gas, instead I use them to heat, agitate and stabilize my "Imbert" combustion zone, and then to fuel it, around 2/3 to 4/5 of it. Regards, Saiteja -------------- next part -------------- A non-text attachment was scrubbed... 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